License idtech to/from who?
Microsoft owns id and idtech?
id is already an in house studio, they even helped out with visuals of Starfield.
Theres no reason to assume id wouldnt have id engineers working with studio x to make a Halo game, if not id themselves.
P.S I know UE5 is still fresh, i been following it since it launched.........I work in UE5 after my company saw its real time demos and decided it would make an excellent "low quality" or realtime renderer, and ive been
"forced" to basically learn UE5 to teach the rest of the render team.
Im thinking of secretly just using D5 or making a bunch of studio levels/environments which the rest of the team can just Datasmith assets into with a few variables exposed for any fine tuning they might want to do.....teaching old dogs new tricks can be a chore.
P.P.S If you are expecting the visuals to look good and the game to run at 60fps then the internal resolution will most certainly be below 1080p....DSR + TSR from 720p - 1080p wouldnt even be remotely shocking.
Fortnite UE5 on nextgen consoles runs with an internal resolution of anywhere from 864p.